Hey there
First of all you should know that Google talk has been replaced by Google hangouts.The application is simple and easy to use.New features such as sms integration allows messaging , chats and im into one place i.e hangouts.With google hangouts you can perform voice, video,text chat by just selecting the contact's id and typing for textual message .For live hangout /video chat you just have to locate video option located at the top right corner and is similar for voice chat too just turn off the video and enjoy.For better understanding watch this youtube videohttps://www.youtube.com/watch?v=-_Kw2H9Koyk
to get a clear view of the application.

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